Waste and exposure pathways

Objective: Explain waste prevention and reuse, distinguish their meanings, and apply them to a described case.

Waste prevention: Prevention avoids creating waste rather than managing it after generation. Reuse: Reuse extends a product's useful life without necessarily breaking it into raw materials. Hazard describes harmful potential, while risk depends on conditions of exposure and consequences. Exposure assessment needs a route, duration, concentration, and relevant population. Dose-response relationships vary among substances and organisms. Waste prevention, reuse, and recycling address different stages and can have different impacts. A defensible comparison defines the service and considers both intended benefits and unintended pathways rather than relying on an alarming label alone. Application: A production change eliminates an unnecessary disposable component. This most directly illustrates waste prevention. A container is used repeatedly for the same purpose. This most directly illustrates reuse.

Objective: Explain hazard and exposure pathway, distinguish their meanings, and apply them to a described case.

Hazard: A hazard is the potential of an agent or condition to cause harm. Exposure pathway: An exposure pathway describes how an agent reaches a person or organism. Hazard describes harmful potential, while risk depends on conditions of exposure and consequences. Exposure assessment needs a route, duration, concentration, and relevant population. Dose-response relationships vary among substances and organisms. Waste prevention, reuse, and recycling address different stages and can have different impacts. A defensible comparison defines the service and considers both intended benefits and unintended pathways rather than relying on an alarming label alone. Application: A chemical can damage tissue under sufficient exposure. This most directly illustrates hazard. A contaminant moves from soil into drinking water. This most directly illustrates exposure pathway.

Objective: Explain dose and risk, distinguish their meanings, and apply them to a described case.

Dose: Dose is the amount received or absorbed under a specified measure. Risk: Risk combines the likelihood and consequences of harm under specified exposure conditions. Hazard describes harmful potential, while risk depends on conditions of exposure and consequences. Exposure assessment needs a route, duration, concentration, and relevant population. Dose-response relationships vary among substances and organisms. Waste prevention, reuse, and recycling address different stages and can have different impacts. A defensible comparison defines the service and considers both intended benefits and unintended pathways rather than relying on an alarming label alone. Application: An assessment estimates intake relative to body mass and time. This most directly illustrates dose. A study evaluates both contact probability and expected effects. This most directly illustrates risk.